JPS6143469Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a local anesthetic instrument used in dental treatment, and is particularly designed to administer cryo-anesthesia by utilizing the cooling power of a thermoelectric element.

When performing tooth extractions, gingival incisions, etc., it is common to apply deep anesthesia to the gingival area with a needle, but in order to ease the pain caused by the puncture of the syringe, conventionally anesthetic is applied to the outer surface of the gingival area in advance. The only thing that was done was to apply it, and the sufficient effect could not be obtained.

In contrast, this device does not use anesthetics and is capable of locally rapidly cooling the affected area by simply applying it to the gums, allowing cryoanaesthesia to be administered deep into the mouth. The overall shape is small and easy to operate so that it does not interfere with internal use, and the cooling mechanism provided at the tip is extremely miniaturized by using a thermoelectric element.

As is well known, a thermoelectric element is an element that generates or absorbs heat using the Bertier effect, and in particular, elements that combine p-type and n-type semiconductor compounds such as bismuth tellurite have a large amount of heat. Also, since it absorbs a large amount of heat, it is possible to make a large temperature difference, and it has been used in various manufacturing devices, heating devices in medical equipment, and the like.

This idea uses an extremely small thermoelectric element currently on the market, such as a square panel with a side of 4 to 10 mm and a thickness of 2 to 4 mm, as a cooling mechanism to achieve sufficient anesthesia. Effects can be obtained. This panel is made with a temperature difference of 50 degrees Celsius, which means that the temperature on the high-temperature side is the sum of the amount of heat generated by the applied current and the temperature on the low-temperature side. If 3.1 volts and 16 amperes of direct current were applied, the other side, which is the cooling side, would reach 0°C, and by applying 3.75 volts and 20 amperes, the high temperature side would be held at 50°C. In this case, the low and high sides will be -6°C.

In this way, the high temperature side is further forcedly cooled.
If the heat is dissipated and maintained at a temperature below .degree. C., a -10.degree. C. cooling surface can be obtained on the low-temperature side, and it is also possible to make the low-temperature side a -40.degree. C. cooling surface by forcibly cooling the high-temperature side.

An example of this invention will be explained with reference to the drawings.
Reference numeral 1 is the main body, which is made in the shape of a hollow rod with a conduit 2 in the lower half and a pair of left and right branch pipes 3 in the upper half. Next, reference numeral 4, 4 is a cap-shaped member that can be freely attached to the tips of the branch pipes 3, 3, and as shown in FIG. Connecting elements 6, 6 are provided protruding from the lower edge of the proximal end. 7 is a panel of the semiconductor compound of the thermoelectric element; 8;
8 is a ceramic plate placed between both sides of the plate.

At the tips of the branch pipes 3, 3 of the main body 1, a set of two fluid pipes 9, 9 are provided with their upper ends open. After being discharged into the cap-shaped member 4 and cooling the lower surface of the panel 8, the other one of the tubes 9
is discharged through. This fluid may be cooling water, and in this case, it goes without saying that the joint between the branch pipe 3 and the cap-shaped member 4 should be made waterproof. Further, it is convenient if the branch pipes 3, 3 and the conduit 2 are partially formed of flexible or elastic pipes so as to be bendable, as shown in FIG. Further, in order to enhance the cooling effect, it is preferable to widely attach a heat sink 11 to the high temperature side surface of the thermoelectric element 7 as shown in FIG. Furthermore, if a thermistor (not shown) is attached to one side of the low temperature side surface of the thermoelectric element 7 and connected to a thermometer, light emitting diode, buzzer, etc., temperature changes on the low temperature side surface can be easily detected. Furthermore, if the mister and bimetal are linked together, the temperature on the cold side can be kept constant.

This device has the above-mentioned structure, and by holding the grip part 2 and applying the cap-shaped members 4, 4 so that the tips thereof sandwich the gum area, the affected area can be cooled and the gingival area can be sufficiently frozen to the deep part. . In this case, if the gum region is to be cooled from only one side, one cap-like member 4 may be removed and the plug 10 may be fitted in its place, as shown in FIG. 2B. In addition, during the above-mentioned freezing, the surfaces other than the cap-shaped members 4 and 4 should be covered with a heat insulating material in advance so that there is no risk of frostbite even if the lips or tongue other than the area to be anesthetized come into contact with the area, or the surfaces other than the cap-like members 4 and 4 should be covered with a heat insulating material, or In order to prevent pain caused by this, a structure may be added in which the power supply voltage is gradually increased from a low voltage via a resistor or the like.
On the other hand, if the gums or teeth have sufficiently cooled and are frozen and the anesthesia device is difficult to remove, it is sufficient to simply switch the (+) and (-) electrodes to thaw them.

As mentioned above, this device can be easily operated even in pinched places in the oral cavity, and since it is extremely simple in structure, there is no risk of damage, and it can be used for tooth extraction, incision of the gums, and removal of bone. It is suitable for use in tooth cutting, tooth pulp treatment, etc. Furthermore, it is possible to determine whether the pulp nerve is alive or dead by cold-thermal reaction from the outer surface of a tooth covered with a metal crown or the like. Moreover, it has many advantages, such as there is no risk of side effects caused by anesthetics, and the treatment time can be shortened because paralysis is quickly resolved.

[Brief explanation of the drawing]

Figure 1 is a front view, Figure 2A is a vertical sectional view of the main parts,
FIG. 2B is a longitudinal sectional view when the cap-like member is removed and a stopper is fitted in its place. Symbols in the figure: 2 is a conduit, 3 is a branch pipe, 4 is a cap-like member, 5 is a thermoelectric element, 6 is a connection terminal, 7 is a panel, 8 is a ceramic plate, 9 is a fluid pipe, 10 is a stopper, 11 indicates a heat sink, and a indicates a tooth.

Claims (1)

[Scope of utility model registration request] A separate plate-shaped thermoelectric element 5 is attached to the tip of the branch tube of the hollow rod-shaped main body 1, which has a pair of left and right branch tubes 3, 3 whose tips are opposed to each other with a gap between the top ends of the conduit 2.
A cap-like member 4 with a connecting terminal 6 protruding from the proximal edge thereof is removably fitted into the hollow rod-like main body 1, with its low-temperature side surface exposed to the outside as the top surface. A dental anesthesia device comprising fluid pipes 9, 9 for cooling the conductive wire and the high-temperature side surface of the thermoelectric element, which are enclosed within the conduit 2.